Table 6-2B: Fault Codes (inverter fault) & Messages
Message Description Action
Red COMM
Fault
(F22)
The internal communication
connection is disconnected
Contact customer service for
technical support
Contact customer service for
technical support
Ground Cur.
High
(F24)
Insulation problem of PV array
to ground
1. Check the insulation of Solar inputs
2. Contact customer service for
technical support
DSP COMM
Fault
(F23)
The internal communication
connection is disconnected
Iac Unbalance
(F26)
1. Power line is disconnected
inside the inverter
2. Current feedback circuit is
defective
Check the connection in AC plug
RCMU Fault
(F27)
RCMU circuit is disconnected
Contact customer service for
technical support
Contact customer service for
technical support
Grid relay short
Grid relay open
Contact customer service for
technical support
AC RLY Short
(F28)
AC RLY Open
(F29)
Bus Unbalance
(F30)
Voltage unbalance of
DC link
Restart inverter by DC switch
Bus Voltage High
(F31,F33,F35)
High bus capacitor voltage
1.Restart inverter by DC switch
2.Check the solar array setting, and make
sure the Voc less than Max. Vdc of Inverter
(if the error code comes along with E30)
AC Current High
(F36,F37,F38
F39,F40,F41)
Surge occurs during operation
Contact customer service for
technical support
Contact customer service for
technical support
AC CT Fault
(F42)
AC CT is defective
AC current over range Restart the inverter by DC switch
AC Current High
(F45)
60
Error Message and Trouble Shooting
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